Cisco 7609 User Manual

9-10
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
Chapter 9 Configuring VLANs
Configuring VLANs
Note • When the router boots, if the VTP domain name and VTP mode in the startup-config and vlan.dat
files do not match, the router uses the configuration in the vlan.dat file.
• You can configure extended-range VLANs only in global configuration mode. You cannot configure
extended-range VLANs in VLAN database mode.
VLAN Configuration in VLAN Database Mode
Note You cannot configure extended-range VLANs in VLAN database mode. You can configure
extended-range VLANs only in global configuration mode. RPR+ redundancy does not support
configuration entered in VLAN database mode. Use global configuration mode with RPR+ redundancy.
If the router is in VTP server or transparent mode, you can configure VLANs in the VLAN database
mode. When you configure VLANs in VLAN database mode, the VLAN configuration is saved in the
vlan.dat files. To display the VLAN configuration, enter the show vlan command.
You use the interface configuration command mode to define the port membership mode and add and
remove ports from a VLAN. The results of these commands are written to the running-config file, and
you can display the file by entering the show running-config command.
Creating or Modifying an Ethernet VLAN
User-configured VLANs have unique IDs from 1 to 4094, except for reserved VLANs (see Table 9-1 on
page 9-2). Enter the vlan command with an unused ID to create a VLAN. Enter the vlan command for
an existing VLAN to modify the VLAN (you cannot modify an existing VLAN that is being used by a
Layer 3 port or a software feature).
See the “VLAN Default Configuration” section on page 9-6 for the list of default parameters that are
assigned when you create a VLAN. If you do not specify the VLAN type with the media keyword, the
VLAN is an Ethernet VLAN.
To create or modify a VLAN, perform this task:
Command Purpose
Step 1
Router# configure terminal
or
Router# vlan database
Enters VLAN configuration mode.
Step 2
Router(config)# vlan
vlan_ID{[-vlan_ID]|[,vlan_ID])
Router(config-vlan)#
or
Router(vlan)# vlan vlan_ID
Creates or modifies an Ethernet VLAN, a range of
Ethernet VLANs, or several Ethernet VLANs specified in
a comma-separated list (do not enter space characters).
Router(config)# no vlan vlan_ID
Router(config-vlan)#
or
Router(vlan)# no vlan vlan_ID
Deletes a VLAN.

Cisco 7609 Specifications

General

Brand	Cisco
Model	7609
Category	Network Router
Language	English